>>But there is a reason that he was the first person to win both the Hugo and Nebula awards...and he won them both two years in a row.
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>???
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>http://en.wikipedia.org/wiki/List_of_joint_winners_of_the_Hugo_and_Nebula_awards

According to that list, he was the first (and only one) to win them both 2 years in a row.